I bought a oversized D20 at my local game store a week or so back. Naturally I had to have some scape dice that were the same size. I went to Hobby lobby and found a 4 pack of oversized block looking dice. Spraypainted them black. Used the technique I had used before when refacing Heroscape Dice with vinyl. Used a couple of quick passes with some gloss clear coat and they are done.
I present my Big Scape Dice: